griffiths



(N0 Model.) 2 Sheets-Sheet I.

W. H. GRIFFITHS. INTERLOGKING GONHPULLEY.

310589 989. Patentd Sept. 14,1897;

(NoMo-del.) 2 Sheets-Sheet 2.

W. H QGRIFFITHSF INTERLOGKING CONE PULLBY No.589,989 PatentedSept.14,1897.

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Parent neurone, lllASSAGIlUSE'FlS.

inrsstocnrno cons euttsv.

srncrrroarron formingpart of Letters Patent No. 589,989, dated.$eptembe1f 14, 1897. Application filed October 7, 1898- Serial Ho.608,118. (No modeli)" lb all whom it may concern.-

Be itknown that I, WILLIAM H. Ginnsrrns, of Medford, in the county ofMiddlesex and State of Massachusetts, have invented an improvement ininterlocking adjustable conepulleysapplied to parallel shafts or to twoshafts or'counter-shafts, as may be desired to accomplish the bestresults which may be attained by my invention, of which the followin hisis'a specification.

My invention relates to improvements in what are known. as expansible'pulleys, composed of two sections capableof relative movement. Inpractice these expansible pnl leys are arranged upon shaft-s, therelative speed of rotation of which is to be controlled or regulated bysimultaneously increasing the belt-running surface of the pulley uponone shaft and decreasing such surface of the co pulley on the othershaft.

"The invention has for its object to improve pulleys of this class torender them capable of moreperfect and satisfactory operation; andto'this end it consists in the novel con struction, arrangement, andcombination of parts hereinafter described and claimed, reference beinghad to the accompanying drawings, in which- Figure l is a plan view oftwo pulleys con structed in accordance with my invention arranged upontwo parallel shafts with connected operating mechanism. Fig. 2 is asectional elevation thereof. Fig. 3 is a vertical longitudinal section.of one of the pulleys ar- 5 ranged upon a'shaft, the two parts thereofbeing adjusted to increase substantially to the extent of their capacitythe belt-running surface of the pulley; Eight. 4 ends are broken detailplans showin g different devices 0- for adjusting the pulleysections.

I Pulleys of my invention are adapted for use in'connection with shaftsfor driving machinery in the'several arts and for speed adjust.

ment of ,motor carriages orcars, and especially in such mechanisms whereaccuracy of rotation and nicety of adjustment are essential.

In the drawings 1 have illustrated two of the pulleys in usefuloperative relation, and

5c in which the reference-letter A represents a driver to which rotarymotion may be imparted by suitable power, and the other will perform thefunction of a driven shaft, the

' regulated or controlled. i Each shaft B is provided with a feat-her D,to cause the pulleys to rotate therewith and-yet permit of longitudinaladjusting movement thereon.

pansible pulley of ih iproved construction, which is composed of' twounterpart sections,a.s shown. E ch'section is composed of two parts,one phirt'consisti-ng of a head H, from which extends a hub I,' havingan an-' nular groove J, adapted to bel engaged by the pulleyedjustidgmechanisimgas hereinafter referred to. Projecting froniff'siaid head Hin the opposite direction is a flaring or frustocone-shaped open-endedshell F, preferably perforated atintervals of itscircumferential wallfor the sake of lightness and economy of material; The rim of the shellF is considerably thickened, as at G, ahd the thickened rim is providedwith a series of seats ference. The other component part ofthis sectionof the pulley consists; of a head F, formed with a series of integralseparated seats they are secured removably by screws G one head passinginto the spaces which separate the fingers of the other, and then theshells Farhi Gved'into juxtaposition with the seats G in the thickenedrims, registering with the free ends of the series of fingers F,

they are secured by means of the screws The pulley may be assembledbefore or after it is mounted upon the shaft. I

' By my'inventio'n as thusdescribed I' have improved the construction ofextensible pulleys inthat the two parts composing each counterpartsection of the pulley are sepafingers, whereby they remain firm underthe relative speed of rotation of which is to be i G, arranged atintervals around its circumfingers F flaring outwardly therefrom and Iat their free ends resting in the seats G of the thickened rim of theshell F, in which In assembling the two counterpart sec tions composingthe pulley the two, heads: F j are brought near together, with thefingers of r so that the latter may rest in said seats, where i lpractice one of thes'e shafts will'constitube a I The reference'lettefrE designates my exrably connected together, enabling me to providesupport for both ends of the separated 'terpart sections to adjust thebelt-rumfing tension of the transmitting-belt and afford no opportunityfor the latter to slip. Then, as heretofore, the ends of the fingerswhere they extend from the head F in my improved pul ley are allowed tobe free or in the air, they give or spring under the tension of thebelt, permitting the latter to slip, which has been found a seriousdefect in instances whereac-v curacy of movement and nicety ofadjustmeutare essential. it will be seen also that by my improvedconstruction the sectionalpulley can be easily assembled with its partsin operative relation and that it is readily separable for repair incase of injury.

Having described the construction of the improved pulley, I will now setforth the related means for relatively moving the counsurface toregulate or control the relative speed of rotation of the shafts onwhich the pulleys are arranged.

A belt K trained over the pulleys to transmit motion from one to theother thereof, and, as before explained, the pulleys are splined uponthe shafts, so that they rotate therewith, butare capable oi movementlongitudinally thereof.

Referringto Fig. l of the drawings, thereference-letter K designates apair of shipperlevers, pivoted intermediate their ends upon the 'frameA. They are" forked at their extremities and provided with studs s,engaging the grooves .l of the pulley-hubs I, as shown. The letter Ldesignates cross-bars pivoted at their opposite ends tothe opposite endsof swivel-arms M, the latter being pivoted at N to the frame A. Thesecross-bars are also pivoted to the shipper-levers. To one of thes\i-'ivcl-arms M a handle 1 is secured, by manipulation of which themossbars are operated to cause the two ends of the shipper-leversconnected to one pulley to approach or rceede relative to one anotherand simultaneously therewith cause the opposite ends of saidshipper-levers torccede or approach each other, whereby corresponding:movement is imparted to the respective pulleyseciions. 'lhus when theonepulley is collapsed to increase the other is extended to decrease thebelt-running surface, so that the aggregate belt-running surface of thei P connecting: said handle with onev of the shipper-levers. In big. 5the means shown consist of a shaft S, journaled in the frame screwsengaging, respectively, with the two shipper-levers, and a handle 'forrotating said screw-shaft. The shipper-levers, when either the meansshown in Fig. 4 or those of Fig. 5 are shown, are connected with thepulley-sections, as in Fig. 1 of the drawings, and, if found desirable,ball-bearings may be interposed in the connection.

l am aware that extensible pulleys, broadly considered, are not new withme and such therefore I do not claim.

Having thus described my invention, what I claim as of my invention is1.. In an extensible pulley the combination of two counterpart sectionseach section consisting of a daring shell provided with a hub' and a rimformed with seats, and-a head provided with integral, separated fingersresting at their free ends in said seats and rcm0v able means securingthem therein, the fingers of one section passing into the spacesseparating the fingers of the other section, substantially as described.

2. In an extensible pulley the combination of two counterpart sections,each section consisting of a flaring shell provided with a hub and athickened rim formed with seats, and

a head provided with integral, separated-fingel-s resting at their freeends in said seats, removhble means for securing them therein, thefingers of one section passing into the spaces separating the fingers ofthe other section, and shippenlcvers engaging the said hubs,substantially as described.

\VlLLIAM II. GRIFFITHS. 'itneSSOS:

l.. M. lluncuss, l1. R. SrANLEY.

.A, and provided with right and left hand

